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<h2><b>tan </b></h2><p>

<code>tan(<i>expr</i>)</code><p> 

Applies the trigonometric tangent function to the <code><i>expr</i></code>
which is assumed to be in radians. Operates on both gridded and station
data. 
<H3>Usage Notes</H3><P>
<H3>Examples</H3><P>
